<!DOCTYPE html>
<html lang="en">

<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <meta http-equiv="X-UA-Compatible" content="ie=edge">
    <title>Document</title>
</head>

<body>
    <form id="form" name="form">
        <input type="text" name="username" id="">
        <input type="text" name="email">
        <input type="submit">

    </form>
    <script>
        var form = document.getElementById("form");
        form.onsubmit = function () {
            console.log(this.username.value);
            console.log(this.email.value);
            return false;
        }
    </script>
</body>

</html>